5-Alkylidene-hexahydro-1H-cyclopenta[c]pyrrol-1,3-diones by nickel(0) or palladium(0) catalyzed [3+2] cycloaddition of methylenecyclopropanes with maleimides
作者:Paul Binger、Andreas Freund、Petra Wedemann
DOI:10.1016/s0040-4020(01)80117-4
日期:1989.1
Nickel(0) catalyzed [3+2] cycloaddition of methylenecyclopropanes 1a - e with N-substituted maleimide 3b (R = CH3) and 3c (R = Ph) leads almost exclusively to the title compounds 6 and 7. The same reaction occurs in the presence of a palladium(0) catalyst with lower selectivity. Neither unsubstituted maleimide (3a) nor maleic anhydride (2a) undergo this metal catalyzed cycloaddition. With isopropylidenecyclopropane
镍(0)与N-取代的马来酰亚胺3b(R = CH 3)和3c(R = Ph )催化亚甲基环丙烷1a-e的[3 + 2]环加成反应几乎只导致标题化合物6和7。在具有较低选择性的钯(0)催化剂存在下,会发生相同的反应。未取代的马来酰亚胺(3a)和马来酸酐(2a)均未经历该金属催化的环加成。与异亚丙基环丙烷(1b)发生烯反应,得到共聚体4a,b,而(二苯基亚甲基)环丙烷(1c))与两个当量的2a在Diels-Alder反应中反应,得到共三聚体5。